Heating and mixing apparatus.



H. D. MILES.

HEATING AND MIXING APPARATUS.

APPLICATION FILED JUNE 18, 1908.

1,039,779, Patented Oct. 1, 1912.

2 SHBETSSHEET 1.

I III .I I I I I II ill I I II I I II I III I I l COLUMBIA PLANOalAfl-r COWWASHINOTON n. c.

H. D. MILES.

HEATING AND MIXING APPARATUS.

APPLICATION FILED JUNE 13,1908.

Patented Oct. 1, 1912.

COLUMBIA PLANOGRAPH C0,. WASHINGTON, n. c

UNITED STATES PATEN T OFFICE.

HENRY 1). MILES, OF 4 MACHINE COMPANY, OF BUFFALO, NEW YORK, A CORPORATION OF NEW YORK.

HEATING AND MIXING APPARATUS.

Specification of Letters Patent.

Application filed June 13, 1908.

a downwardly dished bottom and is open at the top but if desired the same may be otherwise constructed. Various means may be provided for feeding the liquid to be into the tank and with- 1,039,779. Patented Oct. 1,1912.

Serial N 0. 438,405.

To all whom it may concern:

Be it known that I, HENRY D. MILES, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented a new and useful Improvement in Heating and Mixing Apparatus, of which the following is a specification.

his invention relates to a liquid heating and mixing apparatus which is more particularly designed for use in connection with a vacuum drying and impregnating apparatus whereby wood is impregnated with a preservative or electric coils are impregnated with an insulating material, but which may also be used for other purposes.

In some forms of heating and mixing through this conduit.

WVhile the liquid is in the tank the same is maintained at the required temperature and consistency by means of an outer heater which operates upon the outer portion of the bodv of liquid and an inner heater which he purpose of maintaining the central part of the body of liquid at the proper temperature and consistency. This construction is objectionable because the material under treatment thickens on the exterior of this heat ing chamber and reduces keeping the material at the required temperature, also because leakage is liable to occur at the joints between the heating chamber and the pipes, whereby the heating medium is fed to the heating chamber and the condensation is removed therefrom and for the further reason that such a construction is more complicated and expensive to maintain in proper working condition.

The object of this invention is to provide a liquid heating and mixing apparatus of this character in which the above mentioned objections are avoided.

In the accompanying drawings consisting of two sheets: Figure 1 is a vertical section of a liquid heating and mixing apparatus embodying my invention. Figs. 2 and 3 are horizontal sections in lines 22 and 33, Fig. 1, respectively. Fig. 4 is a fragmentary horizontal section, on an enlarged scale in line M, Fig. 1. Fig. 5 is a fragmentary horizontal section in line 5-5, Fig. 1.

Similar letters of reference indicate corresponding parts throughout the several views.

A represents the tank reservoir, or holder which is adapted to contain the liquid to be heated and mixed. As shown in Fig. 1, this tank has an upright cylindrical body,

liquid between the inner and outer heaters and thoroughly mixes the same so that the body of liquid is uniform throughout. The outer heater may be of any suitable con struction, that shown in the drawings consisting of a coil D of pipe arrangedadjacent to the inner side of the body and bottom of or medium such as steam and an outlet (Z at its lower end for the discharge of the water of condensation. The inner or con tral heater is stationary and preferably constructed in the form of a chamber an upright cylindrical body E, a lower head e secured to the lower end of the body and removably supported on the stool B and an upper head 6 secured to the upper end of the body and extending above the top of the tank. The heating medium such as steam is fed into the heating chamber through an inlet or supply pipe F connected with the upper end of its upper head and the water of condensation is discharged therefrom by an outlet pipe F extending from the lower end of the lower head downwardly through the hollow stool and the adjacent part of the liquid conduit C, a

stuffing box f being provided between the latter and the outlet pipe for preventing leakage at the joint between the same. The central heatng chamber is prevented from turning by a that side boss 6 on the underside of its lower head engaging with a core respondingly shaped socket e in the top of the stool, as shown in Fig. 5.

Altl 101] gb ing the liquid under treatment may be variously constructed that shown in the drawings is suitable for this purpose and consists essentially of a lower pair of diametrically opposite arms Gr, Gr constructed to term a. hub 9 between them which turns on a bearing 9 formed on the periphery of the lower head of the heating chamber, a driving sleeve or hollow shaft H journaled with its bore upon the periphery of the upper part of the upper head of the heating chamher while the central part of its periphery is journaled in a bearing I formed in a cross piece or bridge J arranged on the upper end of the tank, an upper pair of diametrically opposite arms G G constructed to form a hub Z: between them which is secured to the lower end of said sleeve, upright outer bars L, L connecting the outer ends of the pairs of arms, an intermediate bar Z connecting the upper and lower arms on the same side of the heating drum, and paddles or wings on projecting from the lower arms downwardly toward the bottom of the tank. If desired the several vertical members of the agitator may be connected midway of their height by a cross bar Z Each pair of agitator arms is preferably constructed in two parts, each of which consists of one arm and a semicircular hub section, the hub sections of both arms being applied to opposite sides of the respective head of the heating chamber and connected together by bolts, as shown, or by other appropriate means. The means shown in the drawings for rotating this agitator consists of a bevel gear wheel N arranged at the upper end of the driving sleeve, a horizontal driving shaft 0 journaled in bearings 29 on the cross piece or bridge and provided with a bevel pinion n engaging with the gear wheel and tight and loose pulleys (1, secured to the driving shaft and adapted to receive a driving belt. The driving sleeve is prevented from rising on the upper heating drum head by a collar h secured to said head above the driving sleeve.

In the absence of any provision to prevent it the material which is being heated and mixed will gradually thicken upon the periphery of the central heating chamber and reduce its heating eliiect. To avoid this a scraping device is provided which moves around the body of the heating chamber and either in contact with its periphery or close thereto so that it operates to remove the stirrer or agitator for mixpregn ated valve in the pipe mg the liquid to be sucked from the mixing and heating tank into the impregnating tank air is admitted to the same,

the material from the periphery of the heating drum, whereby accumulation or thickening of the material thereon the same is maintained in the highest state of eiiiciency for heating the liquid uniformly. The scraping device tor this purpose shown in the drawings consists of an upright blade R arranged lengthwise of the periphery of the body at the heating chamber and provided at its upper and lower ends with out wardly oii'set arms 0, 1" which are adjustably secured to the adjacent arms of the agitator by means of bolts 8, 8 arranged on said agitator arms and passing through radial slots 8 of the scraper arms. By adjustably con necting the scraper with. the agitator it is possible to bring the scraper into the proper position relatively to the heating chamber. tosuit the consistency of the material under treatment or other conditions and it also renders it possible to take up any wear which may occur between the cooperating surfaces of the scraper and the heating drum.

Inasmuch as the inner heating chamber is stationary no difficulties are encountered In.

keeping tight the joints between the same and the steam inlet. and condensation outlet pipe; it also reduces the amount of power required to operate the apparatus inasmuch as there are fewer parts When installed the lower end of the tank A is connected by the pipe G with the lower end of an impregnating tank which has a removable cover at its top to permit of introducing and removing the articles to be imtrom said last mentioned tank and which is connected with means whereby the air may be exhausted from said impregnating tank or compressed air may be delivei'ed into said impregnating tank, the pipe C being provided with a valve to permit of establishing or interrupting communication between said tanks. In using this apparatus said valve is closed, a batch of impregnating mixture is heated and mixed in the tank, a

charge of articles to be impregnated, such as blocks 0t wood or electric coils are placed in the'impregnating tank and the latter is closed tight. After the air has been exhausted from the impregnating tank to an the extent to produce the desired vacuum,

G is opened, thereby causand submerge the articles in the latter. After the liquid has been thus transferred into the impregnating tank, the valve in the pipe C is closed, the exhaust device is cut 0 from the impregnating tank and compressed is prevented and to rotate, andit also enables the outer side of the heating chamber thereby causing the impregnating fluid to be pores or crevices of the articles under treat ment. After this pressure has been maintained a sniiicient length of time to insure impregnation, the valve in the pipe 0 is opened, whereby the compressed air in the impregnating tank causes the liquid in the latter to be expelled therefrom into the heating and mixing tank A, after which the valve in the pipe C is closed and the impregnating ta k opened for removing the treated articles therein and replacing the same by untreated articles preparatory to beginning another cycle of operations.

I claim as my invention:

1. A liquid heater and mixer comprising a liquid holder or tank, a stationary heating chamber arranged centrally in the tank and adapted to contain a heating medium, an agitator arranged in the tank and rotatable around said heating chamber, and a scraper engaging with said heating chamber, substantially as set forth.

2. A liquid heater and mixer comprising a liquid holder or tank, a stationary cylindrical heating chamber arranged centrally in the tank and adapted to contain a heating medium, a movable agitator arranged in the tank, and a scraper mounted on the agitator and engaging with the periphery of said heating chamber, substantially as set forth.

A liquid heater and mixer comprising an upright tank, an upright stationary cylindrical heating chamber arranged centrally in the tank and supported at its lower end on the bottom of the same, a scraper engaging said chamber, and an agitator arranged in the tank and connected with the scraper, substantially as set forth.

4-. A liquid heater and mixer comprising an upright tank, an upright stationary cylindrical heating chamber arranged centrally in the tank and supported at its lower end on the bottom of the same, and an agitator arranged between the bore of the tank and the periphery of the heating chamber and rotatably supported on said heating chamber, substantially as set forth.

A liquid heater and mixer comprising an upright tank, an upright cylindrical heating chamber arranged centrally in the tank and supported at its lower end on the bottom of the same, an agitator arranged in the tank and rotatably supported on said heating chamber, and a scraper mounted on the agitator and engaging the periphery of the heating chamber, substantially as set forth.

6. A liquid heater and mixer comprising an upright tank, an upright stationary cy lindrical. heating chamber arranged centrally in the tank and supported at its lower end on the bottom of the same, an agitator arranged between the bore of the tank and the periphery of the heating chamber and roforced into the tatably supported on said heating chamber, and means for rotating said agitator connected with the upper part of the same, substantially as set forth.

A liquid heater and mixer comprising an upright tank, an upright cylindrical heating chamber arranged centrally in the tank and supported at its lower end on the bottom of the same, an agitator arranged in the tank and rotatably supported on said heating chamber, a scraper mounted on the agitator and engaging the periphery of the heating chamber and driving means connected with the upper part of the agitator, substantially as set fort 8. A liquid heater and mixer comprising an upright tank, an upright cylindrical heating chamber arranged centrally in the tank and supported at its lower end on the bottom of the same, an agitator arranged in the tank, and a scraper engaging said heating chamber and adjustably connected with the agitator, substantially as set forth.

9. A liquid heater and mixer comprising an upright tank, a stool secured to the bottom of the tank and having a passage through which the material to be heated and mixed is fed into the tank and withdrawn therefrom, an upright heating chamber arranged centrally within the tank and having a cylindrical body, a lower head resting on said stool and an upper head, a rotatable agitator having upper and lower arms journaled on said upper and lower heads and bars connecting said arms, and a driving sleeve surrounding said upper head and connected with the upper arms of the agitator, substantially as set forth.

10. A liquid heater and mixer comprising an upright tank, a stool secured to the bottom of the tank and having a passage through which the material to be heated and mixed is fed into the tank and withdrawn therefrom, an upright heating chamber arranged centrally within the tank and having a cylindrical body, a lower head resting on said stool and an upper head, a rotatable agitator having upper and lower arms journaled on said upper and lower heads and bars connecting said arms, and a scraper engaging with the periphery of the body of the heating chamber and connected at its upper and lower ends with the upper and lower arms of the agitator, substantially as set forth.

11. A liquid heater and mixer comprising a tank, a stool secured to the bot-tom of said tank and having a flat sided socket, and a heating chamber having a flat sided boss engaging with said socket, substantially as set forth.

12. A liquid heater and mixer comprising a tank, a stool secured to the bottom of said tank and having a flat sided socket, a heat ing chamber having a flat sided boss engaging With said socket, an agitator rotatable Witness my hand this 11th day of June, on said chamber and having a driving sleeve 08.

at its upper end, a bridge arranged on the HENPY D MU ES tank and having a bearing in which said N J sleeve is journaled, and a collar arranged Witnesses:

on the heating chamber above the driving T1 1150. L. Pom sleeve, substantially as set forth. E. M. GRAHAM.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

